Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 2,583	$ 1,396	$ 915
Interest or penalties	0	0
Net increase in valuation allowance	20,500	9,200
Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	46,500
Operating Loss Carryforwards, Not Subject to Expiration	$ 98,500
Percentage of taxable income limitation of net operating loss carryforwards	80.00%
Tax Credit Carryforward	$ 5,700	3,200
State
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	46,200
Tax Credit Carryforward	$ 5,300	$ 2,900